Stanhope Demonstrator
The Stanhope Demonstrator was the first machine to solve problems in logic. It was designed by Charles Stanhope, 3rd Earl Stanhope to demonstrate consequences in logic symbolically. The first model was constructed in 1775. It consisted of two slides coloured red and gray mounted in a square brass frame. This could be used to demonstrate the solution to a syllogistic type of problem in which objects might have two different properties and the question was how many would have both properties. Scales marked zero to ten were used to set the numbers or proportions of objects with the two properties. This form of inference anticipated the numerically definite syllogism which Augustus De Morgan laid out in his book, ''Augustus_De_Morgan#Formal_Logic, Formal Logic'', in 1847. Construction The device was a brass plate about four inch, inches square which was mounted on a piece of mahogany which was three-quarters of an inch thick. There was an opening with a depression in the wood ...
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